The Classes

The IMSA WeatherTech SportsCar Championship features two styles of cars – Prototype (P), which showcases the latest automotive technology and are uniquely designed for the racetrack, and Grand Touring (GT), which is based on road-going production models. These two styles of cars make up the series’ three classes – Prototype, GT Le Mans (GTLM) and GT Daytona (GTD).

Pro (Red) & Pro-Am (Green)

 

The three WeatherTech Championship classes are designated as either Pro or Pro-Am, based on the driver lineups. Prototype and GTLM follow the Pro category and typically feature a professional driver lineup, while GTD, a Pro-Am class, pairs one professional driver and one amateur driver.

IMSA implemented a color system to help fans easily identify a class of car. A Pro class is designated by RED markings on the number panel, mirror, windscreen banner, rear wing end plate, class decal, and leader light.

A Pro-Am class is designated by GREEN markings on the number panel, mirror, windscreen banner, rear wing end plate, class decal, and leader light.

Leader Light System

 

To help fans follow the on-track action, the WeatherTech Championship uses a Leader Light System. It allows fans to easily identify the position of each car in its respective class.

The position of the car is displayed on an LED panel mounted on the side of the car and the color of the LED number corresponds with the red (Pro) and green (Pro-Am) colors.

For instance, an illuminated LED red number 5 on a GTLM (Pro) style car means that car is in 5th position in the GTLM class.

Class Specifications


Prototype (P)

 

The Prototype (P) class features the fastest and most technologically advanced cars in North America. They are specifically designed and engineered for the race track and look drastically different than a typical street car. These cars follow either the Daytona Prototype international (DPi) model or the classic LM P2 model.

TOP SPEED: 200 mph
HORSEPOWER: 600
WHEELBASE: Length varies
WEIGHT: 2,046 lbs/930 kg
HEIGHT: 41.4 in./1050 mm
WIDTH: 71-75 in./1800-1900 mm
CARS: Acura ARX-05 DPi, Cadillac DPi-V.R, Mazda RT24-P, Nissan DPi, Onroak Ligier JS P217, ORECA 07, Multimatic Riley MK30
ENGINES: Gibson 4.5L NA V8, Mazda 2.0L Turbo I4, Acura 3.5L Twin-Turbo V6, Nisan 3.8L Twin Turbo V6, Cadillac NA V*
FUEL: E-20
GEARBOX: 6-speed paddle shift
TIRES: Continental
CHASSIS: Carbon fiber monocoque
SUSPENSION: Front and rear - independent coil springs, upper and lower A arms
TRACTION CONTROL: Permitted

 

 


GT Le Mans (GTLM)

 

The GT Le Mans (GTLM) cars are the most elite and fastest GT cars on the track. They are based on production models and are engineered to extract the maximum performance possible. The class serves as a true proving ground for leading manufacturers such as BMW, Corvette, Ferrari, Ford, and Porsche.

TOP SPEED: 180
HORSEPOWER: 525
WHEELBASE: Length varies; based on production vehicle design
WEIGHT: 2,745 minimum
HEIGHT: Height varies; based on production vehicle design
WIDTH: 79 inches
CARS: BMW M8 GTE, Chevrolet Corvette C7.R, Ferrari 488 GTE, Ford GT, Porsche 911 RSR
ENGINES: BMW V8 Turbo, 5.5-liter Chevrolet pushrod 2-valve, Ferrari V8 Turbo,  Ford EcoBoost Turbo, Porsche flat 6
FUEL: VP Racing Fuel E-20C
GEARBOX: 5-speed or 6-speed
TIRES: Open (Michelin currently participating)
CHASSIS: Steel tubing and integral roll cage or production tube with cage, based on production model available to the public
SUSPENSION: Front and rear - independent coil springs, upper and lower A arms
TRACTION CONTROL: Permitted


GT Daytona (GTD)

 

The GT Daytona cars are enhanced technology. They are also based on production model cars but do not feature the same level of aerodynamics and power as the GTLM class cars. The GTD class consists FIA GT3-spec cars and is the only Pro-Am class in the WeatherTech Championship.

TOP SPEED: 175
HORSEPOWER: 500
WHEELBASE: Length varies; based on production vehicle design
WEIGHT: 2,680 pounds
HEIGHT: Height varies; based on production vehicle design
WIDTH: 79 inches
CARS: Acura NSX GT3, Aston Martin Vantage GT3, Audi R8 LMS GT3, BMW M6 GT3, Ferrari 488 GT3, Lamborghini Huracan GT3, Lexus RF GT3, Mercedes AMG-GT3, Nissan GT3-R, Porsche 911 GT3-R
ENGINES: Acura V6 Turbo, Aston Martin V12, Audi 5.2-liter V10, BMW V8 Turbo, Ferrari V8 Turbo, Lamborghini 5.2-liter V10, Lexus 5.0-liter V8, Mercedes 6.2-liter V8, Porsche 4.0-liter flat 6
FUEL: VP Racing Fuel E-10
GEARBOX: 6-speed
TIRES: Continental
CHASSIS: Steel tubing with integral roll cage or production tube with cage; based on production model available to public
SUSPENSION: Front and rear - independent coil springs, upper and lower A arms
TRACTION CONTROL: Permitted
ABS: Permitted

 

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